Document that the string returned by strerror(3) contains a maximum of

NL_TEXTMAX characters.

src/lib/libc/string/strerror.3

@@ -33,7 +33,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.\"	$OpenBSD: strerror.3,v 1.3 1999/05/23 14:11:03 aaron Exp $
+.\"	$OpenBSD: strerror.3,v 1.4 2000/10/23 19:14:41 aaron Exp $
 .\"
 .Dd June 29, 1991
 .Dt STRERROR 3
@@ -49,7 +49,11 @@
 The
 .Fn strerror
 function returns a pointer to the language-dependent error message
-string affiliated with an error number.
+string affiliated with the specified error number
+.Fa errnum .
+The returned string contains a maximum of
+.Dv NL_TEXTMAX
+characters, including the trailing NUL.
 .Pp
 The array pointed to is not to be modified by the program, but may be
 overwritten by subsequent calls to